【单选题】如要关闭Excel中的工作簿,但又不想退出Excel,可以单击( )
【简答题】取样必须具有 ___________ 、 __________ 和 ____________ 。
【单选题】At one time it was the most important city in the region ---- a bustling commercial center known for its massive monuments, its crowded streets and commercial districts, and its cultural and religious...
A.
Teotihuacan, once the home of 200,000 people, was the center of a large empire.
B.
Many archaeologists are fascinated by the ruins of a pre-Columbian city called Teotihuacan.
C.
Teotihuacan, once a major metropolitan area, was destroyed by an invasion.
D.
A still unsolved mystery is why the people of Teotihuacan suddenly abandoned their city.
【简答题】取样必须具有()、()和()等三性,做到均匀、合理。
【判断题】药物分析工作中,要求取样必须具有科学性、真实性和代表性。
【单选题】At one time it was the most important city in the region—a bustling commercial center known for its massive monuments, its crowded streets and commercial districts, and its cultural and religious inst...
A.
Teotihuacan, once the home of 200,000 people, was the center of a large empire.
B.
Teotihuacan, once a major metropolitan area, was destroyed by an invasion.
C.
A still unsolved mystery is why the people of Teotihuacan suddenly abandoned their city.
D.
Many archaeologists are fascinated by the ruins of a pre-Columbian city called Teotihuacan.
【简答题】The city is at once both modern and ancient.